Reenforced-fiber container closure and method of making the same



E. F. HULBERT Filed Oct. 26. 1925 /0 l,&\\\\\\\\\\\\\\\\\\\\\\\\\\\\\R'EENFORCED FIBER CONTAINER CLOSURE AND METHOD 0F MAKING THE SAME June29 1926.

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1 VEN ToR BY F 1 TTORNEYJ Patented June 29, 1926.

UNITED STATES PATENT OFFICE.

EDWIN' F. BULBEET, OF MILWAUKEE, WISOONSIN, ASSIGNOR TO THE MASTER PACK-AGE CORPORATION, OF' OWEN, .WISCONSINQ A CORIORATION OF DELAWARE.

REENFORCED-FIBER CONTAINER CLOSUEE AND METHOD4 OF MAKING THE SAME.

Application n led October 26, 1925. Serial No. 65,000.

The invention relates to fiber containers and to a method of making thesame.

, Theobject of this invention is'to so treat the fiber siding ofthecontainer as to clamp the head between an inturned flange and bent overedge of the siding and to hold the parts thus combined firmly in placeby a metal band applied to the siding and enf gaging the head.

The invention further consists in the several features hereinafter setforth and more particularly defined by claims tat the conclusion hereof.

In the drawings, Fig. 1 is a detail sectional view showing the siding inthe forming apparatus;

Fig. 2 is a View similar to Fig. 1, showing the siding in partiallyformed condition;

Fig. 3 is a detail sectional view through ,the container parts andforming apparatus during the head-assembly operation:

Fig. 4 is a view similar to Fig. 3, showing the parts in finished form;

Fig. 5 is a side elevation view. partly in section, of the finishedcontainer bodv.

In the drawings the numeral 6 designates the tubular siding 0f the coveror bodv of the container. This siding is formed of pressed pulp or anumber of wrappings of fiber or paper sheets andis generally cylindricalor conical in form.

The siding 6 is first held between an internal expanding chuck 7 and anexterna-l `contracting; chuck 8 which cooperate with plungers 9 and 10to form a space 11 into which the upper end 12 of the siding projects.The face'13 of the chuck 8 is offset from the end 12 to provide aclearance space.

-The face 14 of the chuck 7 is curvedy up#- wardly toward its outer edgeto form an annular curved portion and the face 15 of the plunger 9 isspaced therefrom for a short distance before said plunger contactswiththe chuck to .form a lateral annular extension 16 of the space 11.The plunger 10 has an annular part 17 working between the chuck 8 andthe plunger 9. and provided with a curved edge 18 which, upon beingmoved downwardly, engages the upper edge of the end 12 of the siding andturns it'over and works it down into the extension 16 and thus forms abend 19 in the siding and an inwardly extending lflange 20. This actionoccurs because the fiber of the siding at the upper end, under theaction of the plunger 10, becomes pliable enough to be turned over andforced into the position shown in Fig. 2.

With the siding thus initially formed it is placed over an anvil orchuck21 and a head-piece 22 is started within the bent-over edge of thesiding and/moved downwardly* to the position shown in Fig. 3 by a clamping plunger 23. and then an external contracting chuck 24 is actuated tosqueeze the sides of the bent upper end of the siding between it and thehead and to clamp the siding below the head to the chuck-21, the faceportion 25 of said chuck 24 causing a lateral off-set in the sidingadjacent the head.

A band 25 of thin sheet-steel or other suitable sheet-metal is thenplaced about the outer side of the bent-over edge of the siding andseatson the annular shoulder 27 of the chuck 24 and has its upper edge 28slightly curved inwardly.

Thereafter the anvil 21 is raised to clamp the head 22 between it andthe plunger 23 and has an annular recess 29 in its face to accommodatethe flange 20. If desired, a facing piece 30 may be laid over the anvil21 and secured by adhesive to the head 22 and over the ange 20.

Thereafter a forming plunger 31, having an annular part 32 provided witha curved edge 33 and working between the' chuck 24 and the plunger 23,is moved downwardly f to roll the free end of the band over thebent-over edge of the siding and bend this edge over against the headand clamp it in this position. as shown in Fig. 4` whereby the .head isfirmly secured within the siding between the flange 20 and the bent-overedge l2 of the siding.

What I claim as my invention is:

1. In a container. the combination of tubular fiber siding having an endportion with a return bend and an inwardly extending annular flange. ahead seating against Said fiange and fitting within the turned over endportion'of said siding, and a metal band elampingly engaging theextended ends of said siding and the head.

2. In aeontainer, the combination of 5 tubular ber siding having adouble Wall end portion and a flange extending inwardly from the end ofthe inner Wall of said end portion, a head seating against said flangeand fitting Within said double wall end portion, that part of saiddouble end portion above the head extending inwardly over the head, anda meta] band clampingly engaging said double Wall end portion.

In testimony whereof, I aix my signature.

EDWIN F. HULBERT.

